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                            <b>1.</b>
                        
                        项目介绍
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                            <b>1.1.</b>
                        
                        ToutiaoWeb虚拟机使用说明
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                            <b>1.2.</b>
                        
                        Pycharm远程开发
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                            <b>1.3.</b>
                        
                        产品与开发
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                            <b>2.</b>
                        
                        数据库
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                            <b>2.1.</b>
                        
                        数据库设计
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                            <b>2.2.</b>
                        
                        理解ORM
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                            <b>2.3.</b>
                        
                        SQLAlchemy映射构建
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                            <b>2.4.</b>
                        
                        SQLAlchemy操作
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                            <b>2.5.</b>
                        
                        数据库理论
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                            <b>2.6.</b>
                        
                        分布式ID
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                            <b>2.7.</b>
                        
                        数据库优化
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                            <b>2.8.</b>
                        
                        Redis
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                            <b>3.</b>
                        
                        Git工作流
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                            <b>3.1.</b>
                        
                        Gitflow
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                            <b>3.2.</b>
                        
                        Git总结
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                            <b>3.3.</b>
                        
                        工程目录
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                            <b>3.4.</b>
                        
                        调试方法
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                            <b>4.</b>
                        
                        JWT
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                            <b>4.1.</b>
                        
                        JWT &amp; JWS &amp; JWE
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                            <b>4.2.</b>
                        
                        PythonLib
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                            <b>4.3.</b>
                        
                        实施方案
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                            <b>4.4.</b>
                        
                        禁用问题
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                            <b>5.</b>
                        
                        对象存储
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                            <b>5.1.</b>
                        
                        七牛云存储
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                            <b>5.2.</b>
                        
                        CDN
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                            <b>6.</b>
                        
                        缓存
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                            <b>6.1.</b>
                        
                        缓存的架构
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                            <b>6.2.</b>
                        
                        缓存的数据
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                            <b>6.3.</b>
                        
                        缓存的有效期与淘汰策略
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        <li class="chapter " data-level="6.4" data-path="C06-Cache/CachePatterns.html">
            
                
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                            <b>6.4.</b>
                        
                        缓存模式
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        <li class="chapter " data-level="6.5" data-path="C06-Cache/CacheProblems.html">
            
                
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                            <b>6.5.</b>
                        
                        缓存问题
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        <li class="chapter " data-level="6.6" data-path="C06-Cache/ProjectCacheAndStorageDesign.html">
            
                
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                            <b>6.6.</b>
                        
                        项目缓存与Redis持久存储设计
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        <li class="chapter active" data-level="6.7" data-path="C06-Cache/ProjectCacheImplement.html">
            
                
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                            <b>6.7.</b>
                        
                        项目缓存实现
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                            <b>6.8.</b>
                        
                        项目Redis持久存储实现
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                            <b>7.</b>
                        
                        APScheduler
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                            <b>7.1.</b>
                        
                        APScheduler使用
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        <li class="chapter " data-level="7.2" data-path="C07-APScheduler/FixStatistics.html">
            
                
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                            <b>7.2.</b>
                        
                        定时修正统计数据
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        <li class="chapter " data-level="8" data-path="C08-RPC/index.html">
            
                
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                            <b>8.</b>
                        
                        RPC
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        <li class="chapter " data-level="8.1" data-path="C08-RPC/AboutRPC.html">
            
                
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                            <b>8.1.</b>
                        
                        RPC简介
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                            <b>8.2.</b>
                        
                        gRPC
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        <li class="chapter " data-level="8.3" data-path="C08-RPC/ProtocolBuffers.html">
            
                
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                            <b>8.3.</b>
                        
                        Protocol Buffers
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        <li class="chapter " data-level="8.4" data-path="C08-RPC/RecoSysIDL.html">
            
                
                    <a href="../C08-RPC/RecoSysIDL.html">
                
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                            <b>8.4.</b>
                        
                        推荐系统接口定义
                    </a>
            
            
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        <li class="chapter " data-level="8.5" data-path="C08-RPC/Server.html">
            
                
                    <a href="../C08-RPC/Server.html">
                
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                            <b>8.5.</b>
                        
                        服务端
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        <li class="chapter " data-level="8.6" data-path="C08-RPC/Client.html">
            
                
                    <a href="../C08-RPC/Client.html">
                
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                            <b>8.6.</b>
                        
                        客户端
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        <li class="chapter " data-level="8.7" data-path="C08-RPC/ToutiaoAPIViewImplement.html">
            
                
                    <a href="../C08-RPC/ToutiaoAPIViewImplement.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>8.7.</b>
                        
                        头条首页新闻推荐接口编写
                    </a>
            
            
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        <li class="chapter " data-level="9" data-path="C09-IM/index.html">
            
                
                    <a href="../C09-IM/index.html">
                
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                            <b>9.</b>
                        
                        即时通信
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            <ul class="articles">
                
    
        <li class="chapter " data-level="9.1" data-path="C09-IM/AboutIM.html">
            
                
                    <a href="../C09-IM/AboutIM.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>9.1.</b>
                        
                        即时通信简介
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="9.2" data-path="C09-IM/WebSocket.html">
            
                
                    <a href="../C09-IM/WebSocket.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>9.2.</b>
                        
                        WebSocket
                    </a>
            
            
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        <li class="chapter " data-level="9.3" data-path="C09-IM/SocketIO.html">
            
                
                    <a href="../C09-IM/SocketIO.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>9.3.</b>
                        
                        Socket.IO
                    </a>
            
            
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        <li class="chapter " data-level="9.4" data-path="C09-IM/Chat.html">
            
                
                    <a href="../C09-IM/Chat.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>9.4.</b>
                        
                        头条聊天服务实现
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="9.5" data-path="C09-IM/MessagePush.html">
            
                
                    <a href="../C09-IM/MessagePush.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>9.5.</b>
                        
                        头条在线消息推送实现
                    </a>
            
            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="10" data-path="C10-Elasticsearch/index.html">
            
                
                    <a href="../C10-Elasticsearch/index.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>10.</b>
                        
                        Elasticsearch
                    </a>
            
            
            <ul class="articles">
                
    
        <li class="chapter " data-level="10.1" data-path="C10-Elasticsearch/Introduction.html">
            
                
                    <a href="../C10-Elasticsearch/Introduction.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>10.1.</b>
                        
                        简介与原理
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="10.2" data-path="C10-Elasticsearch/ConceptAndCluster.html">
            
                
                    <a href="../C10-Elasticsearch/ConceptAndCluster.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>10.2.</b>
                        
                        概念与集群
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="10.3" data-path="C10-Elasticsearch/AnalysisIK.html">
            
                
                    <a href="../C10-Elasticsearch/AnalysisIK.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>10.3.</b>
                        
                        IK中文分析器
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="10.4" data-path="C10-Elasticsearch/IndexAndType.html">
            
                
                    <a href="../C10-Elasticsearch/IndexAndType.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>10.4.</b>
                        
                        索引与类型
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="10.5" data-path="C10-Elasticsearch/Document.html">
            
                
                    <a href="../C10-Elasticsearch/Document.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>10.5.</b>
                        
                        文档
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="10.6" data-path="C10-Elasticsearch/Logstash.html">
            
                
                    <a href="../C10-Elasticsearch/Logstash.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>10.6.</b>
                        
                        Logstash导入数据
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="10.7" data-path="C10-Elasticsearch/Query.html">
            
                
                    <a href="../C10-Elasticsearch/Query.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>10.7.</b>
                        
                        查询
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="10.8" data-path="C10-Elasticsearch/ToutiaoSearchImplement.html">
            
                
                    <a href="../C10-Elasticsearch/ToutiaoSearchImplement.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>10.8.</b>
                        
                        头条全文检索实现
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="10.9" data-path="C10-Elasticsearch/Suggest.html">
            
                
                    <a href="../C10-Elasticsearch/Suggest.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>10.9.</b>
                        
                        suggest查询
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="10.10" data-path="C10-Elasticsearch/ToutiaoSuggestImplement.html">
            
                
                    <a href="../C10-Elasticsearch/ToutiaoSuggestImplement.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>10.10.</b>
                        
                        头条suggest查询实现
                    </a>
            
            
        </li>
    

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                        单元测试
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                        Gunicorn
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                        Supervisor
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                        <h1 id="&#x5934;&#x6761;&#x9879;&#x76EE;&#x7F13;&#x5B58;&#x5B9E;&#x73B0;">&#x5934;&#x6761;&#x9879;&#x76EE;&#x7F13;&#x5B58;&#x5B9E;&#x73B0;</h1>
<p>&#x4EE5;&#x7528;&#x6237;&#x4FE1;&#x606F;&#x6570;&#x636E;&#x7F13;&#x5B58;&#x4E3A;&#x4F8B;</p>
<p>common/cache/user.py</p>
<pre><code class="lang-python"><span class="hljs-keyword">from</span> flask <span class="hljs-keyword">import</span> current_app
<span class="hljs-keyword">from</span> redis.exceptions <span class="hljs-keyword">import</span> RedisError
<span class="hljs-keyword">import</span> json
<span class="hljs-keyword">from</span> sqlalchemy.orm <span class="hljs-keyword">import</span> load_only

<span class="hljs-keyword">from</span> models.user <span class="hljs-keyword">import</span> User
<span class="hljs-keyword">from</span> . <span class="hljs-keyword">import</span> constants


<span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">UserProfileCache</span><span class="hljs-params">(object)</span>:</span>
    <span class="hljs-string">&quot;&quot;&quot;
    &#x7528;&#x6237;&#x8D44;&#x6599;&#x4FE1;&#x606F;&#x7F13;&#x5B58;
    &quot;&quot;&quot;</span>

    <span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">__init__</span><span class="hljs-params">(self, user_id)</span>:</span>
        self.key = <span class="hljs-string">&apos;user:{}:info&apos;</span>.format(user_id)
        self.user_id = user_id

    <span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">save</span><span class="hljs-params">(self)</span>:</span>
        <span class="hljs-string">&quot;&quot;&quot;
        &#x67E5;&#x8BE2;&#x6570;&#x636E;&#x5E93;&#x4FDD;&#x5B58;&#x7F13;&#x5B58;&#x8BB0;&#x5F55;
        :return:
        &quot;&quot;&quot;</span>
        r = current_app.redis_cluster
        <span class="hljs-comment"># &#x67E5;&#x8BE2;&#x6570;&#x636E;&#x5E93;</span>
        user = User.query.options(load_only(User.name,
                                            User.profile_photo,
                                            User.introduction,
                                            User.certificate)).filter_by(id=self.user_id).first()
        <span class="hljs-comment"># &#x5224;&#x65AD;&#x7ED3;&#x679C;&#x662F;&#x5426;&#x5B58;&#x5728;</span>
        <span class="hljs-comment"># &#x4FDD;&#x5B58;&#x5230;redis&#x4E2D;</span>
        <span class="hljs-keyword">if</span> user <span class="hljs-keyword">is</span> <span class="hljs-keyword">None</span>:
            <span class="hljs-keyword">try</span>:
                r.setex(self.key, constants.USER_NOT_EXISTS_CACHE_TTL, -<span class="hljs-number">1</span>)
            <span class="hljs-keyword">except</span> RedisError <span class="hljs-keyword">as</span> e:
                current_app.logger.error(e)
            <span class="hljs-keyword">return</span> <span class="hljs-keyword">None</span>
        <span class="hljs-keyword">else</span>:
            cache_data = {
                <span class="hljs-string">&apos;name&apos;</span>: user.name,
                <span class="hljs-string">&apos;photo&apos;</span>: user.profile_photo,
                <span class="hljs-string">&apos;intro&apos;</span>: user.introduction,
                <span class="hljs-string">&apos;certi&apos;</span>: user.certificate
            }
            <span class="hljs-keyword">try</span>:
                r.setex(self.key, constants.UserProfileCacheTTL.get_val(), json.dumps(cache_data))
            <span class="hljs-keyword">except</span> RedisError <span class="hljs-keyword">as</span> e:
                current_app.logger.error(e)
        <span class="hljs-keyword">return</span> cache_data

    <span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">get</span><span class="hljs-params">(self)</span>:</span>
        <span class="hljs-string">&quot;&quot;&quot;
        &#x83B7;&#x53D6;&#x7528;&#x6237;&#x7684;&#x7F13;&#x5B58;&#x6570;&#x636E;
        :return:
        &quot;&quot;&quot;</span>
        r = current_app.redis_cluster

        <span class="hljs-comment"># &#x5148;&#x67E5;&#x8BE2;redis</span>
        <span class="hljs-keyword">try</span>:
            ret = r.get(self.key)
        <span class="hljs-keyword">except</span> RedisError <span class="hljs-keyword">as</span> e:
            current_app.logger.error(e)
            ret = <span class="hljs-keyword">None</span>

        <span class="hljs-keyword">if</span> ret <span class="hljs-keyword">is</span> <span class="hljs-keyword">not</span> <span class="hljs-keyword">None</span>:
            <span class="hljs-comment"># &#x5982;&#x679C;&#x5B58;&#x5728;&#x8BB0;&#x5F55;&#xFF0C;&#x8BFB;&#x53D6;</span>
            <span class="hljs-keyword">if</span> ret == <span class="hljs-string">b&apos;-1&apos;</span>:
                <span class="hljs-comment"># &#x5224;&#x65AD;&#x8BB0;&#x5F55;&#x503C;&#xFF0C;&#x5982;&#x679C;&#x4E3A;-1&#xFF0C;&#x8868;&#x793A;&#x7528;&#x6237;&#x4E0D;&#x5B58;&#x5728;</span>
                <span class="hljs-keyword">return</span> <span class="hljs-keyword">None</span>
                <span class="hljs-comment"># &#x5982;&#x679C;&#x4E0D;&#x4E3A;-1&#xFF0C;&#x9700;&#x8981;json&#x8F6C;&#x6362;&#xFF0C;&#x8FD4;&#x56DE;</span>
            <span class="hljs-keyword">else</span>:
                <span class="hljs-keyword">return</span> json.loads(ret)
        <span class="hljs-keyword">else</span>:
            <span class="hljs-comment"># &#x5982;&#x679C;&#x8BB0;&#x5F55;&#x4E0D;&#x5B58;&#x5728;&#xFF0C;</span>
                cache_data = self.save()
                <span class="hljs-keyword">return</span> cache_data

    <span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">clear</span><span class="hljs-params">(self)</span>:</span>
        <span class="hljs-string">&quot;&quot;&quot;
        &#x6E05;&#x9664;&#x7528;&#x6237;&#x7F13;&#x5B58;
        &quot;&quot;&quot;</span>
        <span class="hljs-keyword">try</span>:
            current_app.redis_cluster.delete(self.key)
        <span class="hljs-keyword">except</span> RedisError <span class="hljs-keyword">as</span> e:
            current_app.logger.error(e)

    <span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">exists</span><span class="hljs-params">(self)</span>:</span>
        <span class="hljs-string">&quot;&quot;&quot;
        &#x5224;&#x65AD;&#x7528;&#x6237;&#x662F;&#x5426;&#x5B58;&#x5728;
        &quot;&quot;&quot;</span>
        <span class="hljs-comment"># &#x67E5;&#x8BE2;redis</span>
        r = current_app.redis_cluster
        <span class="hljs-keyword">try</span>:
            ret = r.get(self.key)
        <span class="hljs-keyword">except</span> RedisError <span class="hljs-keyword">as</span> e:
            current_app.logger.error(e)
            ret = <span class="hljs-keyword">None</span>

        <span class="hljs-comment"># &#x5982;&#x679C;&#x7F13;&#x5B58;&#x8BB0;&#x5F55;&#x5B58;&#x5728;</span>
        <span class="hljs-keyword">if</span> ret <span class="hljs-keyword">is</span> <span class="hljs-keyword">not</span> <span class="hljs-keyword">None</span>:
            <span class="hljs-keyword">if</span> ret == <span class="hljs-string">b&apos;-1&apos;</span>:
                <span class="hljs-comment"># &#x5982;&#x679C;&#x7F13;&#x5B58;&#x8BB0;&#x5F55;&#x4E3A;-1 &#xFF0C;&#x8868;&#x793A;&#x7528;&#x6237;&#x4E0D;&#x5B58;&#x5728;</span>
                <span class="hljs-keyword">return</span> <span class="hljs-keyword">False</span>
            <span class="hljs-keyword">else</span>:
                <span class="hljs-comment"># &#x5982;&#x679C;&#x7F13;&#x5B58;&#x8BB0;&#x5F55;&#x4E0D;&#x4E3A;-1&#xFF0C; &#x8868;&#x793A;&#x7528;&#x6237;&#x5B58;&#x5728;</span>
                <span class="hljs-keyword">return</span> <span class="hljs-keyword">True</span>

        <span class="hljs-comment"># &#x5982;&#x679C;&#x7F13;&#x5B58;&#x8BB0;&#x5F55;&#x4E0D;&#x5B58;&#x5728;&#xFF0C;&#x67E5;&#x8BE2;&#x6570;&#x636E;&#x5E93;</span>
        <span class="hljs-keyword">else</span>:
            cache_data = self.save()
            <span class="hljs-keyword">if</span> cache_data <span class="hljs-keyword">is</span> <span class="hljs-keyword">not</span> <span class="hljs-keyword">None</span>:
                <span class="hljs-keyword">return</span> <span class="hljs-keyword">True</span>
            <span class="hljs-keyword">else</span>:
                <span class="hljs-keyword">return</span> <span class="hljs-keyword">False</span>
</code></pre>
<p>common/cache/constants.py</p>
<pre><code class="lang-python"><span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">BaseCacheTTL</span><span class="hljs-params">(object)</span>:</span>
    <span class="hljs-string">&quot;&quot;&quot;
    &#x7F13;&#x5B58;&#x6709;&#x6548;&#x671F;
    &#x4E3A;&#x9632;&#x6B62;&#x7F13;&#x5B58;&#x96EA;&#x5D29;&#xFF0C;&#x5728;&#x8BBE;&#x7F6E;&#x7F13;&#x5B58;&#x6709;&#x6548;&#x671F;&#x65F6;&#x91C7;&#x7528;&#x8BBE;&#x7F6E;&#x4E0D;&#x540C;&#x6709;&#x6548;&#x671F;&#x7684;&#x65B9;&#x6848;
    &#x901A;&#x8FC7;&#x589E;&#x52A0;&#x968F;&#x673A;&#x503C;&#x5B9E;&#x73B0;
    &quot;&quot;&quot;</span>
    TTL = <span class="hljs-number">0</span>  <span class="hljs-comment"># &#x7531;&#x5B50;&#x7C7B;&#x8BBE;&#x7F6E;</span>
    MAX_DELTA = <span class="hljs-number">10</span> * <span class="hljs-number">60</span>  <span class="hljs-comment"># &#x968F;&#x673A;&#x7684;&#x589E;&#x91CF;&#x4E0A;&#x9650;</span>

<span class="hljs-decorator">    @classmethod</span>
    <span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">get_val</span><span class="hljs-params">(cls)</span>:</span>
        <span class="hljs-keyword">return</span> cls.TTL + random.randrange(<span class="hljs-number">0</span>, cls.MAX_DELTA)


<span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">UserProfileCacheTTL</span><span class="hljs-params">(BaseCacheTTL)</span>:</span>
    <span class="hljs-string">&quot;&quot;&quot;
    &#x7528;&#x6237;&#x8D44;&#x6599;&#x6570;&#x636E;&#x7F13;&#x5B58;&#x65F6;&#x95F4;, &#x79D2;
    &quot;&quot;&quot;</span>
    TTL = <span class="hljs-number">30</span> * <span class="hljs-number">60</span>
</code></pre>
<h4 id="&#x63A5;&#x53E3;&#x793A;&#x4F8B;">&#x63A5;&#x53E3;&#x793A;&#x4F8B;</h4>
<p>&#x5B9A;&#x4E49;&#x83B7;&#x53D6;&#x5F53;&#x524D;&#x7528;&#x6237;&#x4FE1;&#x606F;&#x7684;&#x63A5;&#x53E3;</p>
<p>GET  /v1_0/user</p>
<p>&#x8FD4;&#x56DE;JSON</p>
<p>&#x5728;<code>toutiao/resources/user/__init__.py</code>&#x4E2D;&#x5B9A;&#x4E49;&#x8DEF;&#x7531;</p>
<pre><code class="lang-python">user_api.add_resource(profile.CurrentUserResource, <span class="hljs-string">&apos;/v1_0/user&apos;</span>, endpoint=<span class="hljs-string">&apos;CurrentUser&apos;</span>)
</code></pre>
<p>&#x5728;toutiao/resources/ user/profile.py &#x4E2D;</p>
<pre><code class="lang-python"><span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">CurrentUserResource</span><span class="hljs-params">(Resource)</span>:</span>
    <span class="hljs-string">&quot;&quot;&quot;
    &#x7528;&#x6237;&#x81EA;&#x5DF1;&#x7684;&#x6570;&#x636E;
    &quot;&quot;&quot;</span>
    method_decorators = [login_required]

    <span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">get</span><span class="hljs-params">(self)</span>:</span>
        <span class="hljs-string">&quot;&quot;&quot;
        &#x83B7;&#x53D6;&#x5F53;&#x524D;&#x7528;&#x6237;&#x81EA;&#x5DF1;&#x7684;&#x6570;&#x636E;
        &quot;&quot;&quot;</span>
        user_data = cache_user.UserProfileCache(g.user_id).get()
        user_data[<span class="hljs-string">&apos;id&apos;</span>] = g.user_id
        <span class="hljs-keyword">return</span> user_data
</code></pre>

                    
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